题目内容

按动态特性可把数据项分为哪几类？它们各有何特点。

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系统分析报告中应写哪些主要内容？

Hewillcomehere____tomorrowmorning.

A. atfifth
B. atten
C. ontwo
D. tilltenth

During____century,theworldpopulationhasalreadyreached6billion.

A. twenty
B. thetwentieth
C. twentieth/
D. thetwenty

Shewas___herearlytwentieswhenshewentabroad.

A. at
B. on
C. of
D. in